Interact  //  Advanced Interface Solutions

Demo Overview

Fast Touch System is the name given to capacitive touch systems developed by Rapid Keypads.  A Fast Touch capacitive touch system consists of Fast Touch electronics, conductive circuit layer and graphic overlay.

Fast Touch electronics is the name given to all the electronics and firmware used by Rapid Keypads to produce a successful capacitive touch system.  At the heart of the Fast Touch electronics is the Fast Touch IC.  The various touch pads of the conductive circuit layer are connected to the Fast Touch IC.  The pads formed by the conductive circuit layer could be copper pours on a PCB or printed conductive elements on a film.  The overlay is non-conductive and placed on top of the circuit layer.  The overlay material could be glass, lexan, acrylic or any other plastic of various thicknesses.

When the human hand is brought in close proximity to the pads of the circuit layer, the capacitance associated with the pad changes.  This causes a change in the voltage measured on the pads.  This change in voltage is registered as a button press by the Fast Touch system.



As a function of this button press, the Fast Touch system can be configured to

  • Produce Tactile feedback to feel every button actuation
  • Produce Audio feedback to hear a custom sound during button actuation
  • Create a plug and play interface that easily replaces your legacy mechanical membrane switch keypad with a new capacitive touch keypad.

The Fast Touch system communicates the button press and release data to the main controller using one or many of the following options

  • SPI
  • UART (RS232/RS485)
  • I2C
  • USB HID communication protocol
  • Simple I/O


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  • USB Keypads
  • Uniform Lighting Numeric Keypad
  • Uniform Lighting Touch Appliance Control
  • Exercise Equipment Touch Control Panel
  • RGB LED Capacitive Position Control
  • Complete Control System Solution
  • Digitally Printed Conductive Film
  • USB Capacitive Touch Joystick Game Pad
  • Industrial Control Panel
  • Capacitive Touch Appliance Oven Control

Compare capacitive touch systems

Other Capacitive Touch Systems

Normal capacitive touch design kits from IC manufacturers contain examples that are far from what is required in an actual product. They leave it upto you to read their application notes and design a system.

Even if you were successful in designing what is shown in these kits, you would still need to design the graphic overlay.  Several aspects of the graphic overlay such as inks and materials used, significantly impact the overall performance of the touch interface.

If your project required a uniformly lit keypad and tactile feedback, there are no practical examples to follow.  You don’t have to reinvent the wheel, when we at Rapid Keypads already possesses the expertise and specialized equipment necessary to design and produce cost effective capacitive touch interfaces and graphic overlays.

Even if you were successful in designing what is shown in these kits, you would still need to design the graphic overlay.  Several aspects of the graphic overlay such as inks and materials used, significantly impact the overall performance of the touch interface.

Jameel Ahed

President, Blue Sparq, Inc.

Rapid Keypads Advantage

We have over three years experience designing and manufacturing capacitive touch systems.  In our Fast Touch system, we look at the graphic overlay, electronics and the conductive circuit layer as one system and understand the effect of each component on the other.

We have developed internal tools to analyze the noise experienced by the capacitive touch system and configure the Fast Touch keypads in their final resting place.  While, choosing the most robust noise rejection filtering algorithm for the application, we also understand that the delay experienced by the system should not be perceivable to the user.

Using our patent pending FORELIGHT technology, we can uniformly light your keypad while maintaining a thin profile.  The Fast Touch System allows the brightness of the lighting to be changed.  This is particularly useful while trying to gradually increase the brightness of the keypad to maximum and gradually decrease the brightness before turning off the interface.

Your microcontroller can't do it all!

Capacitive touch sensing is a very timing sensitive process.  This is because voltage measurements happen in the transient state rather than steady state. In fact it is recommended to disable all other interrupts, while voltage is being measured.  Good EMI immune software techniques and user perception dictate that, such measurements need to be carried out frequently at fast rates.  This leaves very little time left for other tasks.  The greater the number of buttons, the more is the I/O pin resource and scan time requirement.  This is why you need a separate touch controller IC.  Let us make you a custom Fast Touch IC for your application! Click here for a customer testimonial!


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Low Power Consumption

Our Fast Touch ICs have Sleep and Idle modes.  This makes it ideal for use in battery operated and handheld devices.  In the sleep mode, CPU core and the on-chip peripherals are turned off while, in the idle mode, the CPU core is disabled but the peripherals are still active.  We consider the application and its usage patterns to determine, the length of time the keypad shall remain in the sleep/idle state and the length of time the keypad needs to be on.  This maximizes the power savings obtained using our Fast Touch system.

Superior ESD Protection

Our Fast Touch systems use mechanical, electrical and software techniques to protect our boards against ESD events.  A fast touch PCB based keypad having an overlay thickness of 0.060”, adequate grounding and other electrical protection techniques etc. can withstand a single shot ESD event between 15KV and 20KV in magnitude.

The Highest MTBF

Mean time between failures (MTBF) is the predicted elapsed time between inherent failures of a system during operation.  MTBF can be calculated as the arithmetic mean (average) time between failures of a system.  We worked with a Systems Engineer of one of our aerospace clients to determine MTBF of a Fast Touch capacitive touch PCB keypad design.  After going through our bill of materials and looking at the overall design and construction it was determined that the average duration of time the item will operate until it experiences a failure is 1,045,536 hours or 120 years.


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